Contractual interest rate for funds borrowed, under the debt agreement.

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Quarterly Financial Data (Unaudited) (Details) - USD ($) $ in Millions		3 Months Ended	12 Months Ended
	Sep. 22, 2015	Dec. 31, 2017	Dec. 30, 2018	Dec. 31, 2017	Dec. 25, 2016	May 31, 2014
Effect of Fourth Quarter Events [Line Items]
Loss (gain) on extinguishment of debt			$ 0.0	$ 17.3	$ (0.2)
Senior notes \| 7% Senior Notes due 2019
Effect of Fourth Quarter Events [Line Items]
Loss (gain) on extinguishment of debt	$ 3.4	$ 15.2		17.3	$ (0.2)
Stated interest rate			7.00%			7.00%
Kratos Government Solutions (KGS)
Effect of Fourth Quarter Events [Line Items]
Impairment of goodwill		$ 24.2		$ 24.2